Shredding and blending mechanism for feed



R. A. STUBBS.

SHREDDING AND BLEND'ING MECHANISM FOR FEED.

APPLICATION FILED MAY 1. 1915.

, 1 344 8 32 I Patented June 29, 1920.

Iii 1.

UNITED STATES PATENT OFFICE.

ROBERT A. sw ms, or DALLAS, TEXAS, ASSIGNOR or rrmnn-rouarns TO G. w.

GRISWOLLD, or DALLAS, TEXAS.

SHREDDING AND BLENDING MECHANISM FOR FEED.

Specification of Letters Patent.

Patented June 29,1920.

Application filed May 1, 1915. Serial No. 25,175.

To all whom it may concern:

Be it known that I, ROBERT A. STUBBs, a citizen of the United States,residing at Dallas, in the county of Dallas and State of Texas, haveinvented certain new and useful Improvements in Shredding and BlendingMechanism for Feed, of which the following is a specification.

My invention has relation to a shredding and blending mechanism for hay,straw or similar feed and for all loose more or less fibrous materialsand in such connection it relates more particularly to the constructionand arrangement of the shredding teeth, the cylinder carrying the sameand the breast or concave cooperating therewith.

In a companion application filed of even date herewith under Serial No.25174;, I have described and claimed broadly certain related andcooperating mechanisms constituting a machine for shredding and blendingloose materials. While such a machine would require feeding means,compacting means, sheeting mechanism and shredding means to perform themain purposes for which it was designed namely the cutting, shreddingand blending of loose material such as feed or grain, it is obvious thatvarious forms of shredding mechanism might be devised and hence in saidapplication a shredding mechanism broadly was described and claimed.Again it is obvious that the shredding mechanism illustrated in saidapplication and forming the subject matter of this present applicationmight be used alone as a complete machine or might be combined withother mechanisms and still perform its peculiar combined functions ofcuttin splitting and shredding and blending w1icl1 combined functions ofthe machine or mechanism I consider as of my invention without regard tothe peculiar form or mechanical appearance of the machine elementsentering into the mechanism for performing the said combined functions.

The principal objects of my present invention are: First to provide ashredding cylinder whereon shredding teeth of peculiar construction arearranged spirally and cooperate with a concave or breast in performingthe transverse cutting, longitudinal splitting and lateral blending ofthe ma terial;

Second, to provide in such a mechanism a shredding cylinder built up ofa series of obliquely set sections each section carrying a series ofcutting and splitting teeth and all the sections are rigidly assembledtogether to form a cylinder from the surface of which the teeth projectspirally;

Third, to provide in such a mechanism, a tooth having a splitting pointupwardly beveled to form side cutting edges midway of the front or pointand the back of the tooth, and

Fourth, to provide in such a mechanism, a breast or concave consistingof a series of overlapping slats arranged so that an edge of each slatprojects tangentially to the periphery of the shredding cylinder tocooperate with the point and side faces of the teeth in the cutting andsplitting of the material.

The nature and scope of my invention will be more fully understood fromthe following description taken in connection with the accompanyingdrawings forming part hereof, in which' Figure 1, is a front elevationalview of a shredding cylinder and breast embodying main features of myinvention, certain sections of the toothed cylinder being removed todisclose the breast andcertain parts being sectioned to more clearlyillustrate the invention.

v Fig. 2, is a cross-sectional view enlarged to illustrate thecooperation of breast and cylinder and to more clearly illustrate theconstruction and arrangement of the parts.

Fig. 3, is a detail, sectional view taken on line a, a ofFig. 2 toillustrate the adjustment of the breast or concave.

Fig. 4k, is a detail, sectional view, taken on line b, b of Fig. 2.

Fig. 5, is a perspective view illustrating diagrammatically theconnection between the teeth and anobliquely set section of the cylinderand Big. 6, is a detail view illustrating the tongue and grooveinterlocking of the obliquely set sections of said cylinder.

Referring to the drawings 1 represents the shaft and 2 the drivingpulley for the shredding cylinder. The cylinder is made up of endcollars 3 and 4 between which obliquely set spiders 51 are confined. Oneend flange 3 is secured directly to the shaft by means of the collar 6integral with flange 3 whereas the other flange 4 is adjustablelongitudinally on shaft 1 being held to place by the nut 7 arranged tobe advanced or retracted upon a screw threaded portion of the end ofsaid shaft 1. Each fiange has an inner face oblique to the plane of theshaft and the obliquity of the respective flanges is diametricallyopposite to that of the other flange so that when arranged upon theshaft they constitute the ends of a true or substantially true cylinder.The body of this cylinder is made up of the series of the obliquely setspiders 5 each of which has an outer pe riphery 6 revolving in a planeobliquely of the axis of the cylinder. In the preferred construction theperiphery or annulus 6 is connected by radiating arms 7 with a centralhub 8 arranged to slide upon shaft 1 and each hub 8 has on one face anopening 9 and on the opposite face an interlocking offset 10 so that inthe assemblage of the sections on the shaft, the sections and the twoflanges 3' and 1- are all interlocked by a tongue and groove connectionas clearly illustrated in Fig. 6.

Each periphery or annulus 6 of the spiders, has on one face (theirightface in Fig. 1) or side an annular groove 11 concentric with theperiphery of the annulus (3 and leading from this groove 11 are a seriesof recesses 12 angularly arranged. These recesses 12 are cut clearthrough the periphcry or annulus 6. In each of the compartments formedby the combined groove 11 and a recess 12 is placed the shredding tooth.Each tooth has a base 13 closely fitting in the groove 11 and a body 14inclined forwardly from said base 13 and closely fitting in the recess12. Each tooth has a peculiarly formed cutting edge and splitting point,a tooth projecting beyond the annulus 6, the point 15 being at the lowerforward end of the projecting portions of the tooth and the cuttingedges 16 on each side of said projecting portion midway between thepoint 15 and the back 17 of the tooth. To secure the point 15 and thecutting edges 16 the projecting portion of the tooth is upwardly beveledon either side of the medial line of the tooth.

When the sections 5 are assembled a flat unrecessed and ungrooved faceof one section lies upon the grooved and recessed portion of an,adjacent section to confine the teeth in said grooved and recessedportion of said section as clearly illustrated in Fig. 1.

The teeth of the cylinder when all sections 5 are assembled and lockedtogether between the end flanges 3 and 4: are arranged in a path whichis'spirally. disposed with respect to the axis of the cylinder.

The cylinder thus constructed and arranged is adapted to cooperate witha breast or concave of any desired'form but in practice I have foundthat the particular form and construction illustrated in Figs. 1 and 2of the drawings is preferable.

The breast or concave consists of a series of overlapping slats 17 eachfixed at its end in a. curved bracket 18 and when so fixed the upperedge 19 of each slat projects toward the toothed periphery of theshredding cylinder so that a circle drawn through said edges 19 will besubstantially concentric with a circle drawn through the splittingpoints 15 of said teeth. The two curved brackets 18 are united bytransverse stay bars 19 and the frame thus formed is pivotally suspendedfrom the rod 20 supported by the frame work of the machine. The free endof each bracket 18 is provided with a rod 21 traversing the slots 22 inthe frame of the machine. When the nut 23 of the rod 21 is loosened, theadjusting movement of frame and slats toward or away from the teeth ofthe shredding cylinder is permitted.

In the operation of the machine material is presented to the peripheryof the shredding cylinder by the jaws 24: and as the cylinder revolvesthe teeth traverse the material from end to end, each tooth cutting thematerial crosswise and the point of each toot-h splitting the materialendwise. The spiral arrangement of the teeth on the cylinder insures ofa lateral movement of the shredded pieces and hence a blending of thematerial as it passes through the shredding operation.

Having thus described the nature and objects of my invention what Iclaim as new and desire to secure by Letters Patent, is,-

A shredding cylinder comprising a series of connected spiders eachhaving a peripheral annulus with oblique contact faces and each annulushaving on one of its sides an annular groove with connected recessesopening at the periphery of the" annulus and shredding teeth abutting attheir inner ends against the inner wall of the groove and extendingthrough said recesses and projecting beyond the periphery of the saidspiders.

In testimony whereof I have signed my name to this specification.

ROBERT A. STUBBS.

